dressler



March 19, 1929. E. DRESSLER BLOOD PRESSURE-INDICATOR I Filed Dec. 51. 1923 2 sheets-sheet 1 EEEEEE z? t 8H; 3 v

March 19, 1929. E. DRES SLER BLOOD PRESSURE INDICATOR Filed'be c. 51, 1923 2 Sheets-Sheet 2 nwutoz C/zariesEDress Zer Patented Mar. 19, 192 9. I UNITED STATES PATENT OFFICE.

CHARLES E. DRESSLER, OF NEW YORK N. Y.

BLOOD-PRESSURE INDICATOR.

Application filed December 31, 1923. Serial No. 683,718.

The objects of this invention are to provide it is held fixed in the upper part of said body a blood pressure indicatorin which the index portion as by posts 4. The under sideof-said hand or pointer is swung against gravity by plate 1 is provided near one end with a has the pressure being measured and returns to ing 5 having a chamber 13 with an inlet in 5 zero position by gravity; to thus avoid the communication with a tube 6 to which is conuse of springs, and obtain a scalewith uninected the tube 7 from the arm-cuff of blood form spacings or markings; to obtain greater pressure testing apparatus (not shown) by accuracy than is possiblein" a. mercurial inare'movable coupling or nipple 8, which when dicator because of the difference in caliber of detached is held in the-cover 3 of the'case by H) the glass tubing, and also avoid the liability a clip 9. The casing 5 may beof any suitof breakage; to p'rovid'e means for transmitable construction, and as shown comprises upting pressure to move the index hand or per and lower connected sections 10, 11 with pointer without undue friction; to enable a diaphragm 12 clamped between them and such pressure transmitting connections to be in the chamber 13. The inlet. to this chamis readily adjusted, so as to make the hand or her is below and preferably centrally of the pointer come to zero when there is no presdiaphragm. 1 The upper casing section 10 is sure; to provide a folding scale for compactattached tothe plate 1 as by soldering or by ncss when the device is not in use, and enable screws 14, 14 as shown. ,The lower section it to be collapsed and folded in a case to be 11 is removably connected .to the upper sec '20 carried in the pocket; to provide means for .tion, as by screws 15.

locating said scale in proper position when A passage16 through the plate 1 and top opened for use, and means for holding the of the casing 5 provides a slideaway for' a 7 index hand or pointer against undue moveplunger 17, the lower end of which rests upon ment when not in use, and to obtain other the diaphragm 12 and at its upper end im- 25 advantages and results as may be brought out pinges against the' under side of a pressurein the, following description. transmitting lever 18 extending longitudinal- Referring to the accompanying drawing, ly of the plate 1. This lever 18 is preferably in which like numerals of reference indicate of the third class fulorumed at one end in the same parts throughout the several views, and between bearings 19, 19 at opposite sides 30 Figure I is a front elevation of my imof the pin 17 with the lever to extend above proved instrument showing the same in colsaid pin. The other end of the lever 18 is lapsed and folded condition in a case and the bifurcated or forked, as at 20, (Figures 3 and case closed, with the cover of the case in sec- 5) with a pin 21 extending transversely'of the tion to show the arrangement ofthe instrubifurcation and engaging below a finger 22 a; ment therein. projecting centrally from a counterweight 23 Figure 2 is a view similar to Figure 1 wi th in which an indicating hand or pointer 24 is the cover of the case partly open and the infixed at one end to serve as a carrler for said strument adjusted in position for use, the pointer. This counterweight 23 is delicately body portion of the case and some other parts mounted in any suitable manner so that the being shown insection. hand or pointer 24 will swing in a vertical Figure 3 is a plan view of the case and plane, and is shown as pivotally supportedin showing the instrument in the collapsed cona bracket 25 secured to and extending transdition shown in Figure -1. versely of the plate 1, saidbracket (Figure 3) Figure4 is an enlarged detail'of the means having arms 26, 26 projecting upward therea) to actuate the pointer of the indicating from and receiving between them a reduced means. end 27 of the counterweight 23, pivot screws Figure 5 is a plan of the parts shown in 28, 28 in said arms entering sockets in the op- Figure 4, and i posite edges of said reduced portion 27. Figure 6 is a section on the line 6-'-6' of The indicating hand or pointer 24 is a light 60 Fig. 4 looking in the direction of the arrow. rod or bar projecting from the reduced end 27 In the specific embodiment of the invenof and in a direction opposite to the countertion shown in said drawings the operative weight, preferably at one side of the pressure parts are mounted on a base plate 1, which transmitting lever 18, said hand or pointer may be supported in anysuitable manner, extending nearly the entire length of the base 1,10

5' but is preferably mounted in the body porplate 1 and having a returned end 29 at the tion 2 of a box or case having a cover; 3, where extremity to engage in front of a scale 30, the

main portion of said hand or pointer lying at the rear of said scale. This scale isof arcuate form and extends upward from the base plate 1 when in use, and positioned so that the pointer extremity 29 will properly follow it. The lower end of the'scalc extends downward through a longitudinal slot '31 in the plate 1 and is hinged between depending ears 32, 32 with suflicient friction to hold the scale in any position to which it is adjusted. Vhen not in use the scale is folded downward into the slot 31, as shown in Figure 1, and to facilitate its elevationthe scale is provided with a finger piece 33 at its upper edge and near its free end. In order to limit this scale in its I elevated or opened position, so that it will be concentric with the pivot of the'index hand or pointer, a stop is provided, shown as a projection 34 arranged at the heel of the scale and adapted to engage the plate at the end of the slot 31, as shown in Figure 2.

In operation with the scale int-he position shown in Figure 2, pressure entering through the tube 7 and its connections with casing 5 forces the diaphragm 12 upward and this movement is transmitted through the plunger 17 to the lever 18 so as to throw its pin 21 upward lifting the finger 22 and tilting the forward end of the hand or pointer 24 upward, the amount of tilting being read from the scale 30. When the pressure is relieved on the diaphragm the hand or pointer 24 returns by gravity, and will'assume its zero position when the pressure becomes nil, it bein understood that the weight of the hand or pointer overbal'ances the counterweight .23

' sufiiciently for this purpose. A suitable sup port is providedfor the hand or pointer when in its zero position, which I have illustrated in the drawing by having the hand or pointer rest upon the top of the fulcrum for the pressure-transmitting lever 18, as shown in Figure 3. V

Preferably the pressure-transmitting lever 18 has means for adjusting the end 29 of the hand or pointer 24 exactly to zero when said hand or, pointer engages its stop, and I have shown for this purpose the lever 18 made in two overlapping sections held together by screws 35, 35, said overlapping portions being slightly separated except for a transverse rib 36 on one engaging the other, so that as one screw is loosened and the other tightened the angular relation ofthe twksections can be altered and still the lever kept rigid.

It is also preferable to have the pin 21 of the lever 18 which engages the finger 22, ad-

justable lengthwise of said finger, so as to adjust the leverage of the lever 18 with respect to the hand or pointer, and for this purpose I have shown said pin 21 slidable longitudinally in slots 37, 37 of the forked end 20 of the lever 18, see Figures 4 and 6, and provided at one end with an extension 38 bent to lie against the side edge of the lever 18 and in shoe 3.9 to adjust the pin 21.

To prevent the index hand or pointer 24 fromvibrating when the instrument is not in use, which might tend to affect its accuracy, the cover 30f the instrument case is adapted when closed to lightly engage the extremity of the pointer 24 and its counterbalance 23. as shown in Figure 1. It will be noted that said cover 3 also holds the scale 30 in its lowerecl or folded position.

Having thus described my invention I claim: h

1. In a blood pressure indicator, a scale, an'indicating pointer normally held in zero position of the scale by its own gravity, a lever having a transverse pin free from said indicating member but adapted to abut the same, means to mount said pin to have adjustment longitudinally of the lever, and pressure actuated means to transmit movement to said lever and pointer to indicate on,

the scale the force exerted to move ,the

pointer.

2. In a blood pressure indicator, an indicating member, a lever having a slotted end,

a pin in the slot engaging said indicating member and having an extension at one side of the lever, means for releasably clamping said extension to the lever, and means for transmitting pressure to said lever.

3. In a blood pressure indicator, an indicating member including a pointer, a lever comprising relatively angularly adjustable connected sections, means adjustable connected to the lever to engage the indicating member, and means for transmitting pressure to said lever. e

4. Ina blood pressureindicator, a pointer, a lever-fulcrumed at one end comprising sections relatively angularly adjustable and having an adjustable connection with the pointer, and means for transmitting pressure to said lever between its and connection with the pointer.

5. In an indicator, an indicating member, an arcuate hinged scale adapted to 'be extended to indicate the said member and to be folded into substantial alinement with said member whenin idle position, a stop for holding said scale in confulcrumed support extent of movement of indicating member adapted to assume a pro-- determined position at one end of the scale by gravity, a counterbalance for said indicating member, means for transmittingpressure to said indicating member to move the same relative to the scale against the force of gravity, and means for engaging said indicating member and counterbalance to hold them against movement.

8. In a blood pressure indicator, a gravity operated indicating member, a counterbalance for said indicating member, means for transmitting pressure to said indicating member, and a casing in which said parts are mounted and having a cover arranged when closed to engage said indicating member and counterbalance to restrict movement thereof.

9. In a blood pressure indicator, an indicating member, a lever having a slotted end, a pin to engage in the lever slot and having an angular extension to extend parallel of the lever at one side thereof,-a shoe slidable transversely of the lever arranged to receive said pinextension, means for sliding said shoe, and means for transmitting pressure to said lever.

10. In a blood pressure indicator, an indi-.'

eating member, a lever having a slotted end,

a pin to engage in the slot having an angular extension-to extend parallel with and at one side of the lever, a shoe slidable transversely of the lever arranged to receive said pin extension, a screw at the opposite side of the lever threaded into said shoe to draw the shoe to the lever and clamp thepin thereto, and means for transmitting pressure to .said

lever.

lluIn a blood pressure indicator, a base plate, a gravity-operated indicating member mounted on said plate, a casing in which said base plate. is mounted and having a cover to enclose the indicating member in the casing, a diaphragm box in said casing beneath the base plate having an inlet opening at one side of the diaphragm, means for transmitting pressure from the diaphragm to the indic-ating'member, a nipple detachably connected to the inlet opening of thediaphragm casing, and means in the indicator casing to releasably support the nipple.

' 12. In a blood pressure indicator, an indi-- cating pointer, a pivoted and-counterweighted support for the pointer adapted to move and normally maintain the pointer in a subs'tantially horizontal position, ascale relative to which said pointer is movable, an adjustable lever having an adjustable connection with the pivoted support of the pointer, a casing, a diaphragm in the casing arranging a. chamber at one side of the diaphragm in the casing arranged for connection with a source of pressure, a pin slidably mounted in and extended through an opening in.the wall of the casing at the opposite side of the diaph 'agm and arranged to rest upon the. "diaphragm and the ad j ustablc lever to rest upon said pin, said pin being operative to transmit the movement of the diaphragm through the lever to the pivoted support of the pointer and thereby move the pointer relative to the scale proportionally to the force on the movement of the diaphragm.

13. In a blood pressure indicator, an armate scale having graduations reading in an upward direction, an indicating pointer to co-operate with the scale normally assuming a zero position in relation to theseale by gravity, a lever having a transverse pin free from said indicating pointer and adapted to abut the same, and means for transmitting pressure to said lever.

1%. In a blood pressure indicator, a casing; anarcuate scale pivotally mounted in the casing adjacent one end adapted to extend upward from the casing in a predetermined position and to fold into the casing; a pointer pivotally mounted at one end in the casing adjacent the end opposite to that at which the scale is mounted and the free end arranged to eo-opcrate with the scale when in position to extend upward from the casing, and adapted to normally assume a substantially horizontal position by gravity and a position in juxtaposed and parallel relation to the scale when the latter is folded into the casing and a cover .for the casing to enclose the indicator therein.

15. In a blood pressure indicator, a casing; an areuate scale pivotally supported at one end in the casing adjacent one end thereof, said scale being adapted to be adjusted to extend upward from the casing and folded into the casing; a pointer to eo-operate with said scale; a carrier in which one end of the pointer is fixed fulcrumed in the casing adjacent the end opposite to that at which the scale is supported, said carrier being ar- 1 ranged with a counterweight to counterbalance the pointer whereby the latter will assume a substantially horizontal position by gravity, a pressure actuated lever fulcrum'ed at one end in the casing and having an operative connection with the carrier for the pointer at the side from which the pointer pro ects: and a cover for the casing to enclose saidparts therein.

16. In a blood pressure indicator, a casing; an arcuatescale pivotally supported at one endin the casing adjacent one end thereof, sald scale being adapted to be-adjusted to extend upward from the casing and folded into the casing; a counterbalanced pointer tom- IOU Cal

operate with the scale having a fulcrumed support in the-casing at the end opposite to that at which the scale is supported; a pressure actuated lever fulcrumed at one end in the casing and having an operative connection at the opposite end with the fulcrum support of the pointer at the side from which the pointer projects, said lever comprising angularly adjustable sections whereby to adjust 1 the connection thereof with the fulcrum support of the pointer; and a cover for the casing to enclose said parts therein.

'17. In a blood pressure indicator, a casing; an arcuate scale pivotally supported at 'one end in the casing adjacent one end thereof,

said scale being adapted to be adjusted to extend upward from the casing and folded into the casing; a counterbalanced pointer to cooperate with the scale having a fulcrum sup- 4 port in the casing at the end opposite to that at which the scale is supported; a pressure actuated lever fulcrumed at one end in the casing and extending in a direction toward the fulcrumed support of the pointer; a pin projecting from the fulcrum support of the pointer in a direction toward the lever; a pin to extend transversely of and carried at the end of the lever to have adjustment in adirection toward and away from the pin of the fulcrumsupport of the pointer; and a cover for the casing to enclose said parts therein. l

18. In a bloodp-ressure indicator, a casing; an arcuatescale pivotally supported at one end in the casing adjacent one end thereof, said scale being adapted to be adjusted to extend'upward from the-casing and folded into the casing; a counterbalanced pointer to cooperate with the scale having a fulcrum support in the casing at the end opposite to that at which the scale is-supported; a fulcrumed pressure actuated lever extending in-a direction toward the fulcrum support of the pointer, said lever comprising sections adapted to be adjusted in angular relation to each other; a pin projecting from the fulcrum support of the pointer; a pin to extend trans- .verselyof and carried by the lever to have adjustment in a direction toward and away from the pin of the fulcrum support of the pointer ;'and a cover for the casing to enclose said parts therein.

19. In a blood pressure indicator, a casing; an arcuate scale pivotally supported at one end in the casing adjacent one-end thereof, said scale being adapted to be adjusted to extend upward from the casing and folded into the casing; a counterbalanced pointer to cooperate with the scale having a fulcrum support in the casing at the end opposite to that at which the scale is supported; a lever ful-" crumed at one end in the casing and having I an operative connection at the opposite en with the fulcrum support of the pointer at the side from which the pointer projects; a diaphragm casing'arranged below the lever having an inlet opening at one side of the diaphragm for a pressure actuatin medium;

a pin slidably 'mounted in said iaphragm casing at the opposite side of the diaphragm and in operative relation thereto adapted to engage the lever; and a cover forthe first casing to enclose said parts therein.-

20. In a blood pressure indicator, a casing;

an arcuate scale adjacent one end thereof, said scale being adapted to be adjusted to extend upward from the casing 'and folded.

into the casing; a counterbalance pointer to cooperate with the scale having a fulcrum support in the casing at the end opposite to that at which the scale is supported; a lever fulcrumed'at one end in the casing and having an operative connection at the opposite 

